Improved bearing for sheaves



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Letters 'Patent No. 103,587, dated May 31, 1870.

IMPRQVED BEARING- FDR SHEAVES.

The Schedule referred to in these Letters Patent and making paxt of the same.

To all indient it may concern:

Be it known that I, WILLrAn W. EASTMAN, of Meadville, in thc county of Crawford and State of Pennsylvania, have invented certain new and useful Improvements in the Center Bearings of Sheaves for Pulley Blocks; and the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing making a part of this specifieation,in whic Figure l represents a side view of the pulley, with a portion of the block-frame or hanger broken out, showing the chilled center, the sleeve or thimble on which the sheave has its bearing.

Figure 2 shows an edge view section through the center' of the pulley and wrought-iron frame, or block equivalent.

Figure 3 is a face view of the plate and chilled bush for the center hole for wooden sheaves for pulleyblocks.

Figure 4 is a section through the same, showing the chilled sleeve on which the sheave turns and has its bearing.

The object of my invention lis to remedy an evil, and prevent the center hole in sheaves or pulleys, and the bolt or pin, on which the great strain, comes in raising weights, from wearing out, and also greatly lessening the friction on the pulley-blocks or tackle.

' My invention consists in chilling the center hole through cast-iron sheaves, and making itsmooth and large enough to receive a chilled cast-iron thimble to fit nicely tor the sheave tov run on, the bolt going through and litt-ing the thimble or screw, holding it firmly clamped in between the sides of the frame or block, so that the sleeve will not turn ou the bolt,

the bearingsurfaces of both sheave and thimble being as hard as metal can be made, and when lubricated, run with the least friction and wear possible.

A chilled iron-plate bushing, and a sleeve or thimble, may also be used for wood sheaves, in the same manner, for ordinary ship-blocks and tackle, which work easier, and will be much more durable.

To enable others to make and use my invention, I will describe it more fully, referring to the drawing and the letters marked thereon. f

My invention, as shown in this application, represents the frame or hanger A, made of wrought iron, with a single sheave or pulley, B, such as'are mostly used in boring artesian or oil wells, where there is a constant action on the pulley B, so that the sheave and pin, when constructed iu the ordinary manuel', will wear out, so as to be' useless, in from one to vthree weeks, and have to be replaced by new ones.

I make my improved tackle-block by casting the sheaves on a smooth iron core, suiiiciently large to tit a sleeve or thimble, e, cast in a mold, so that theJ outer surface will be as hard as metal can be made, with a hole, c, through, of sutiicient size for a bolt, b, of suitable strength, the bolt being provided with a nut,. ll, so that the ends ot' the sleeve e can be brought to bear hard against the frame or hanger A A, and, if desired,

the sides onto it, as shown in the sectional view, tig.

2, so that the bolt I1 will be mostly relieved of the pulling st-rain. lhehard thimble being held so tifrmly forms the pin for the chilled hard surface ot' the hole cast in the sheavc B to work on.

The same improvement may be used with equal success for bushing wood sheaves, by making a chilled bush, E, having a flange plate, F, on one end, to let into one side ot' the hard-wood sheave, to be secured by screws or rivets, through the holes e e iu,the flange F, the sleeve or thimble c and bolt used being the. same'as above described.

It has been practically demonstrated that a block and tackle, constructed as above described, will run and operate more than twice as easy, and last teu times .longer than any of those heretofore in use, and the cost of making is iio'more than those made in thel ordinary manner.

That I claim as my invention, and desire to secure by Letters Patent, is-

Casting the center hole in sheaves for pulley-blocks or tackle on a chill, made to tit and run on a hard chilled cast-iron sleeve or thimble, when the said thimyble is clamped firmly in a frame, hanger, or block, and

secured byva bolt, or its equivalent, substz'tntially in the manner' as and for the purposes set forth.

In testimon y whereof I hereunto subscribe my name in the presence of VILLIAM W. EASTMAN. Witnesses: Y

J. B. WOODRUFF,

J. B. LYpNs. 

